<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="post" action="">
        <input type="text" name="j_username" id="username" placeholder="用户名" />
        <input type="password"  name="j_password" id="password"  placeholder="密码" />
        <input type="submit" id="submit" value="登 录"/>
</form>
</body>
</html>